Improved machine for milling the body of keys



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Letters Patent No. 91,082, lated .Time 8, 1869.

IMPRQVED MACHINE FOR MILLING THE BODY OF KEYS.

The Schedule referred to in these Letters Patent and making part of thesame.

Toall whom it ymay concern Be it known that we, FRANCIS GAFFREY and JoHN L. NETTLETON, of lVcst Cheshire, in the county of New Havemand Stateof Connecticut, have invented a new Improvement in Machine for MillingKeys; and we do hereby declare the following, when taken in connectionwith. the accompanying drawings, and the letters of reference markedthereon, to be a full, clear, and exact description of the same, andwhich said drawings constitute part of this specification, and representin Figure 1, a side view;

Figure 2, a top View; and in Figure 3, a` sectional view enlarged.

The obje-ct of this invention is the construction of a machine formilling keys, that is, for turning or inishng the key between the bowand the bit.

This has heretofore been performed by fixing the bit in the mandrel,which imparts a revolving motion to the key; but in that process themilling turns or twists the key more or less, so that it is necessary,after the key is milled, to straighten or twist it back, so that the eyeand bit are in the proper relative position to each other.

By our invention, this dilculty is entirely overcome, and consists inthe arrangement of two mandrels, the axes of which are in line with eachother, and caused to revolve together', the one holding the key by thebit, the other by the eye, thus turning the key by both ends, and thiscombined with the dies for milling the ke v o enable others skilled inthe art to construct and use our improvement, we will proceed todescribe the same asillustrated in the accompanying drawings.

A. is the bed of the machine, supporting, at their opposite ends,mandrels B and C, in their respective chine, and communicates to bothmandrels a corresponding revolution, through gears F F 0n the shaft,working into pinions f on the respective mandrels, so that bot-l1mandrels revolve in the same direction, and with equal velocity. Themandrel B is constructed to receive the bit ofthe key, as seen in iig.3; the other mandrel, C, so as to hold the eye, as also seen in fig. 3.

On a transverse way, H, two mills, I I, are arranged, so that by theturning of a right-and-left screw, h, the two mills are drawn togetheror forced asunder. The mills are cnt so as to give to the key thedesired form, as seen in fig. 3.

The mills being open, as seen in g. 2, the mandrel C is drawn hack, asdenoted in red, tig. 1, the bit of the key inserted in the mandrel B;theu the mandrel O returned, so as to take the eye, as seen in fig. 3;then the two mandrcls caused to revolve, and the two dies brought up tothe key cut the stem of the key into a corresponding` l'orm. This is alldone at a single operation, and in very much less time than can he doneby the ordinary process. t

By this machine, the mills or dies are out at a very small expense,inasmuch as it is only necessary to make a cherry of the form of thekey-stem, place itin the two mandrels, and the blanks for the mills inposition, and force them against the cherry, and they are cut to thedesired form.

Having fully described our invention, What we claim as new and useful,and desire to secure by Letters Patent, is

rlhe combination of the two maudrels B and C, revolving together, andconstructed so as to receive and hold the key, with the mills I I, thewhole constructed and operating substantially in the manner set forth.

FRANCIS GAFFREY. JOHN S. NET'ILE'ION.

NVitnesses A. J. Trrrs, J. H. SHUMWAY.

